Sinéad O'Connor has been admitted to hospital for treatment of her depression. The singer expects to spend "two weeks" in doctors' care, with a view to be "back and smiling" soon. "Good team," she said. "They will put me back together quick."

It's been about two months since O'Connor married her fourth husband, drugs counsellor Barry Herridge, in Las Vegas. Their relationship quickly ran into trouble: the marriage was "kyboshed" within three hours of the wedding, she wrote in late December, and they decided to divorce. While the couple eventually reconciled, O'Connor confirmed on Friday "it is now [completely] over". Among other problems, she blamed their split on the behaviour of the gossip-seeking Irish press. "I will never again associate myself romantically with anyone," she wrote on her website, "as I could not bear to see these things done again to someone I love."

O'Connor has been open about her mental health problems, asking over Twitter for referrals to a psychiatrist. She reportedly attempted suicide earlier this month. "God obviously wants me around – though I can't think why," she told the Sun. "I just had to make a cry for help." Over the past week, O'Connor has written almost 3,500 words on her blog, meditating on fame, family and depression. "I find it terribly lonely being 'Sinéad O'Connor' in Ireland," she wrote. "I'm 45 yrs of age. All my life I [have] been beaten up for being me, and beating myself up for being me. [And] causin a whole lot of fuckin trouble. An [feeling] like im a total piece of worthless shit and good for nothing but fucking everything up."

"[I] saw that [my husband] was gonna really need me not to be me," she explained. "I just can't not be me. [But] I saw how bad it was for him and his life that he had married me … i lost it. I lost the plot. Utterly lost my mind. And i think it's natural anyone under the type of pressure I am, not to be who they are, would become suicidal, because that's the only way of not being who u are."

On Tuesday, O'Connor revealed on Twitter she is going "off radar" while she seeks treatment. "Was right decision to call hospital," she wrote. "Should only worry if a depressed person DOESNT go hospital. All will be well. Just [a] little time."

O'Connor's long-anticipated ninth studio album, How About I Be Me (And You Be You)? is due on 20 February.